/Engine/Source/Developer/FunctionalTesting/Classes/ScreenshotFunctionalTestBase.h
Pass screenshot pixels and meta data toFAutomationTestFramework. Register OnComparisonComplete which will be called the automation test system when screenshot comparison is complete
void OnScreenShotCaptured ( int32 InSizeX, int32 InSizeY, const [TArray](API\Runtime\Core\Containers\TArray)< [FColor](API\Runtime\Core\Math\FColor) > & InImageData )